US Senate majority leader Mitch McConnell asked the Republican senators to be cautious about their views on the voting to fill up the vacancy left by the death of Justice Ruth Bader Ginsburg at the Supreme Court.

He also urged them not to lock themselves into a position that they may later regret in a letter sent on Saturday, just hours after the death of 87-year-old iconic jurist.

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“Over the coming days, we are all going to come under tremendous pressure from the press to announce how we will handle the coming nomination,” McConnell wrote in a letter addressed to “Dear Colleagues.”

“For those of you who are unsure how to answer, or for those inclined to oppose giving a nominee a vote, I urge you all to keep your powder dry,” he added.

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Following her death, McConnel had announced that President Trump’s nominee to fill her seat “will receive a vote on the floor of the United States Senate.” His decision was soon met with criticism.

However, at least four Republicans senators, including Susan Collins of Maine and Lisa Murkowski of Alaska, had said they will oppose a vote before the election.

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In 2016, McConnell himself had blocked President Barack Obama’s nominee to replace the conservative Justice Antonin Scalia, arguing that in a presidential election year, voters should decide who gets to make the nomination.

McConnel, however, clarified that the 2016 remarks did not set a precedent for this year, because this time the president and the Senate majority are from the same party.